Comparison

세심(sesim) vs ONE

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

세심(sesim)

Features
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The simplest way to manage your habits. Sesim removes unnecessary complexity and keeps only the features you need. Key Features - Check today’s habits - Create habits by type: daily goals or weekly goals - Reminder push notifications - Daily, weekly, monthly, and yearly records - Light and dark themes - Custom accent color settings Simple, focused, and easy to use. Start building your habits with Sesim.

About

ONE

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Not another to-do list. ONE Focus is a single-task focus timer for a deeper life. You commit to one thing at a time—nothing else on screen, nothing competing for your attention. WHY ONE FOCUS? • One thing only — no lists, no tabs, no clutter • Start in one line — type a title, press return, begin • Gentle accountability — a progress check-in every 45 minutes • Five-step progress — 0, 25, 50, 75, or 100%, with an optional note • Quiet by design — no streak anxiety, no gamification, no noise • Night quiet hours — no notifications between 22:00 and 09:00 • Minimal history — see what you've finished, nothing more HOW IT WORKS 1. Enter one thing and start 2. Stay with it — elapsed time keeps you honest 3. Respond to check-ins when prompted (or update progress anytime) 4. Mark complete when you're done 5. Move on to the next moment DESIGNED TO FEEL CALM Editorial Noir typography, generous whitespace, and champagne-gold accents. Dark-first. No feature bloat. No account required. Everything stays on your device. Built for focus, study, deep work, and everyday presence—reading to your child, cooking a meal, taking a walk, creating something meaningful, or simply being here. Download. Pick one thing. Live it fully.

Screenshots

세심(sesim)4 screens
ONE3 screens

Verdict

The call

The clearest difference is update cadence: ONE at every 2 weeks against 세심(sesim)'s every 4 months. 세심(sesim)'s advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

세심(sesim) ships an update every 4 months, ONE every 2 weeks. The most recent releases landed on October 18, 2026 and October 28, 2026 respectively.

Scorecard3 real differences · 3 level
세심(sesim) versus ONE: the parameters behind the verdict, then further details
Parameter세심(sesim)ONE
PriceFreeFree
Update frequencyEvery 4 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size27 MB2 MB
Age rating4+4+
DeveloperMirae Jin骋飞 武

In-app purchases

None

세심(sesim)

No in-app purchases

None

ONE

No in-app purchases

Questions

Is 세심(sesim) free?
세심(sesim) is free to download, with no in-app purchases.
Is ONE free?
ONE is free to download, with no in-app purchases.
Do 세심(sesim) or ONE have ads?
Neither 세심(sesim) nor ONE shows ads.
Which is updated more often, 세심(sesim) or ONE?
세심(sesim) ships an update every 4 months, and ONE every 2 weeks. Most recently, 세심(sesim) was updated on October 18, 2026 and ONE on October 28, 2026.

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